Trimming mechanism for sewing-machines.



J. RIMGPFATT.

TBIMMING MEGHANISM Fon SEWING MACHINES. APPLICATION FILED'JAXLZI, 1907'.

1,117,589, Patented Nov. 17, 1914.

4 SHEETS-SHEET l.

(witnesses Y 2i ux/@ W M J. R. MOFFATT. v

TBIMMING MEOHANISM P OR SEWING MACHINES. APPLxoATIoH nu 1111.21, mov.V

1,1 17,589. Patented Nov. 17, 1914 4 SHEETS-SHEET 3.

J. R. MOFFATT.

TBIMMING MBGHANISM PoR SEWING MACHINES.

APPLICATION FILED JAN.21, 1907A Patented Nov. 17, 1914.

4 BHEETS-BHEET 4.

UNITED STATES OFFICE.

JAMES R. MOFFATT. 0F CHICAGO, ILLINOIS, ASSIGNOR T O UNION SPECIAL MACHINE COMPANY. 0F CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

i .i 1 mso.

Specification of Letters Patent.

Patented Nov. 17, 1914.

Application led January 21, 1907. Serial N o. 353,277.

To (1H fit/wm, 'it 'muy conce/"n:

lle it known that I, Jani-is R. MoFrA'iT, a riti-eu ot' the United States, residing at Cliirago. in the county of Cook, State of illinois` have invented certain new und useiul Improvements in Trimming Mechanisms for Sewin Machines, of which the following is :i fescription, reference being had to thraccompanying drawings, and to the letters and figures of reference marked thereon.

My invention relates to certain new and useful improvements in trimming mechanisms, and while as to some of its features it may be used yfor various purposes, it is more particularly adapted to machines for cutting or trimming one or more of a plurality ofV superimposed layers of fabric prior to the stitching` operation, guiding or deflecting one ol the cut edges away from the stitching mechanism, while the other edge is ser uied by stitching to the layer or layers that have not been cut.

In this type of machine, it is usual to begin the cutting operation as soon as the fabric operated upon, reaches the stitching position. In certain classes of work however. it is very desirous to control this cutting operation so that a portion of the layers of fabric may be first stitched, before the cutting operation begins. For ex' ample, in necking underwear, when the cutting operation begins at the fold in the fabric. the finished product is liable to give way at the top or neck of the garment where said cutting operation began. By controlling this cutting operation however, so that the point where the cutting blade enters the fabric is slightly beyond the edge of .the fold and the cutting operation is raused to cease before the edge of the fold reached on the other side of the neck portion, the resulting product is much stronger and more durable, for in the inished garment there are two or more' or trimming mechanism whereby the same, at the will of the operator, may be thrown into and out of effective operation.

A further object of my invention is to provide a trimming or cutting mechanism uhich includes r. separating and severing blade with controlling mechanism therefor, whereby the working position of said blade may be changed at the will of the operator, and the cutting operation rendered effective or ineffective.

A further object of my invention is to provide means for supporting a trimming blade of the character above indicated, so that said blade may be readily detached trom the machine for the purpose of replacing or sharpening. I do not however, claim broadly the moving of a trimming 'blade so that by the shifting of the working position the same is rendered ineffective in its opeigit'on as said invention forms the subject mat `r of an application of George Scott, 340,915, filed Oct. 27, 1906. My iniention relates to certainimprovements in thc details of the mechanism for operating said trimmer blade.

My invention consists in the novel parts, improvements and arrangements herein after shown, described and claimed.

In the accompanying drawings, I havek a view similar to Fig. 1, showing the cutting blade in its lowered or ineffective position. Fig. 3 is a detail sectional view, showing the relation of the upper trimming member to the lower trimming member, the work support and feed foot' when said upper trimming member is operated to cut the fabric and is in its lowest position. Fi 4 is a view similar to Fig. 3, with the trimming mechanism in its raised-position. Fig. 5 is a view similar to Fig. 3, with the ilpper trimming member in its ineffective or non-cutting position. Fig. 6 is a. view similar to Fig. 5, with the upper trimming memoer in its raised position. Fig. 'i' is a detail sectional view of the worl( support showing the manner of supporting the lower trimming member. Fig. 8 is a view similar to Fig. 7. with the lower trimmin blade removed; Fig. 9 is an end view o lll) the parts shown in Fig. 7. Fig. 10 is av top plan view of the parts of my improved -1nechanism, located beneath the work support. F ig. 11 is a front view of the end of the driving shaft, showing the operating crank pi n for the trimming mechanism. Fig. I2 is a sectional view of the` parts shown in Fig. 11. Fig. 13 is a detail separated view of the means for detachably supporting the upper trimming member. Fig. 14 is a front view of the trimming supporting means. Fig. 15 is a'sectional view 'on the line :v -af of F ig. 11. Fig. 16 is a bot- .tom plan view of a garment stitched on my improved mechanism showing the point at which the cutting mechanism is brought into operation. l* ig. 17 is a detail sectional \iew showing a presser foot and the cutting blade as it is raised into engagement with the farbric showing the manner in which said blade lpenetrates the lower layer of fabric. Fig. 18 is a view similar to Fig. 17, showing the position of the cutting blade relative to the layers of fabric When in cutting operation.

My invention in its preferred form, comprises a work support on which the goods rest, and over which the same are moved by a suitable feeding mechanism. The fabric operated upon is held in place on the work support, by a presser foot. The trimming mechanism is located beneath the work support, and includes a movable blade normally operating above the work support, having a sharp pointed end, which is adapted to penetrate the fabric as the same is fed thereto. This trimming blade is vibrated up andl down, and cooperates with a stationary blade upon the work support to cut the fabric as it passes beneath the same. Mechanism is provided whereby the position of vibration of the cutting blade may be changed, so that said blade will vibrate above the work support, or entirely beneath the same, thus rendering the cutting operation effective or inefi'ectiv The position of vibration of the cutting blade is under the control of the operator, and. it will, therefore, be seen that the cutting blade may be brought into operation to cut the fabric at any desired time, and that also the cutting operation may be caused to cease at the will of the operator. I have also provided means for supporting this movablecutting blade so that the same may be readily detached from the machine for the purpose of replacing or sharpening.

In the present embodiment of my invention, as shown in the drawings, the work support l is'of the usual construction and carries a throatplate which is suitably slotted for the operation of the feed dog 3 of my machine. Said feed dog is carried by a feed bar 4 which is pivoted to a feed frame 5 at the rear of the machine. Said feed frame `jecting lugs 30 and 31.v

is pivoted las at 6 to' the base plate 7, and receives its rocking movement from the crank pin 8, mounted on the forward end of the main shaft i). Mounted on the crank pin 8, is a rocking lever 10, one arm of which is pivoted at 11 to the feed frame. The other arm of said rocking lever is pivoted as at 12 to a link 13, which is pivotally connected at its lower end to an arm lll. Said arm 1l is in turn pivoted to and supijiorted by a lever 15.

The feed dog is given its liairkward and' forward movement for moving the material by the rocking movements of the feed frame above referred to. The feed dog is given its rising and falling movements to feed the material by a suitable eccentric located underneath the feed bar and carried bj.' the main shaft 9.

(.operating with the feed dog 3 is a presser foot 16 carried by a presser bar 17, mounted in the head of the machine in any suitable manner. lVhcn my improved trimming mechanism is used. in connection with a stitch forming mechanism the same may be of any known construction, but I preferably use a two needle stitching mechanism, having a thread carrying looper coperating therewith yto form cross threads or stitches upon ,the under surface of the inaterial stitched. The needles 18, 18 as shown in Figs. 1, and- 10 indicate the position of such stitch formingA mechanism when used.

My improved trimming mechanism comprises' a stationary blade 19 (see Figs. 7, 8, 100 and 9) which is secured t-o the throat plate of the machine 2. Said throat plate in my preferred form of construction is provided with a depending lug 20,wvliich has a seat 21 for the lower trimming member. Said 105 trimming member is held within its seaty by a suitable screw 22, shown in dotted lines in Fig. 9. Said screw is provided with an enlarged head which extends over the trimming blade and clamps the same in .its seat 110 in the throat plate. V

Cooperating with said stationary trimming member is a movable trimming blade 23. ASaid trimming blade 23 has a sharp pointed forward end 2l and a slightly 115 rounded upper surface 25. This trimming member is mounted upon a supporting arm 26, which is secured to a supporting rod 27 by a. suitable screw 28. Said rod 27 is mounted in my improved trimmer support 120 29. Said support 29 has two parallel pro- Said lug 30 is provided with an opening 32 in which one end of the rod 27 is supported, while the other end of said rod passes through an opening 125 This opening in the lug 31 able collars 33, 33.

' '43. The other end of the adjusting screw is The support 29 for the upper trimmer blade is detachably connected to a bracket 34 secured to the base plate 7 of the machine. Said bracket projects forwardly and' upwardly as shown in Fig. 15 and is provided at its upper end with an upwardly extending projection 35 having a lip 36 extending therefrom on its front face forming a seat for a rib 37 on the lower end of the trimmer support 29. At one end of the bracket 34 is an outwardly projecting lug 38 having a semi-circular; depression 39 which registers with the depression 40, formed in the lug` 31. The trimmer support 29 carries an adjusting screw 41 which extends through the lug 30 and is supported thereby. ,Said adjusting screw is provided with a suitable head 42 whereby said screw may be turned. Said screw is held from longitudinal movement in the trimmer support by means of a collar provided with' screw threads 44, which are adapted to engage the threads in the openy ing 39, when said trimmer support is in the trimmer 25, will be moved transversely l justment of t normal position on the machine. As a means for holding the trimmer support on the`bracket 34, I have provided a threaded bolt'45'which engages` a recess 46 in the bracket'34. Said bolt is provided with an enlarged head 47 carrying an operating handle 48. The enlarged head 47 of the bolt 45 has one side thereof cut away so that when the same is turned into the position shown in Fig. 13, said hdad is brought out of contact with the trimmer support. When however, the bolt 45 is turned to the position shown in Figs. 14 and 15, the enlarged head thereof, extends up beyond the trimmer suport and holds the-rib 37 in its vseat in the racket 34.

The means above described for holding the trimmer support on the .bracket does not prevent said support from sliding longitudinally of said bracket. The adjusting bolt 41 however, lengaging.the threaded opening 39, holds the trimmer support from lateral movement. By turning the adjusting bolt 41, it will be seen that the trimmer support is moved longitudinal of the bracket and the trimmer, supporting arm 26 together with of the line of feed and transversely of the stationary trjpnming member. By this ade movable trimmer, said member may be brought into proper coperative .'position with the stationary trimmer blade.

Heretofore in this type of machine, it has been customary to provide a spring for retaining the movable cut-ting member in contact with its coperating member. It has been found however, that, where the moving 'member of the trimmer is held constantly ressed upon the stationary member that the said trimming members are subject to great wear and soon become dull and unfit for use.

-of the supporting rod 27. The forked ends of the arm 29 are brought into clamping relation with the trimmer' supporting rod bv a suitable screw The free end of the arm 49 is provided with a ball stud 51 which engages a link 52 which in turn is connected to the arm 414 mounted on the leverl This link 52 is made in two parts which are adjustably connected together.

The lever 15 which supports one end of the arm 14 is pivotally connected to the base support at 53. This lever, as shown in Figs. 1 and 2, extends to the left of its pivotal support and has a perforated lug 54 which encircles a pivoted stop bolt 55 carried by the bed plate 7 of the machine. Said bolt has threaded thereon an adjustable nut 56, which engages the upper surface of the lug54, when the lever is in its raised position. Said bolt also carries stop nuts 57, 58, whichengage the under surface of said lug 54. A spring 59 secured to a pin 60 on the bed plate at one end and to the lever 15 at the 100 other end normally tends to hold said lever 15 in the position shown in Fig. 1 with the lug 54 in contact with the stop nut 57 The operation of the parts described is as follows z-As the main shaft 9 rotates the 105 crank pin 18 carried thereby causes thev rock lever 10 to be raised and lowered, and oscillated about the crank pin as a center. Viewing Fig. 2 the crank pin moves in the direction of the arrow indicated thereon. 110 This movement of the crank pin causes first a raising of the pivot 12 and a slight oscillation of the rock lever about the pivot 11. A further movement of the crank pin raises the pivot 1,1 and causes a slight oscillation 115 of the rock lever about the pivot 12. A continued movement of the crank pin causes first a lowering of the pivot 12 and then a lowering of the pivot11. The movement up and down of the pivot 11 swings the feed 120 frame and causes the backward and forward unive-:nent of the feed dog, while the up and down movement of the pivot 12 reciprocates the trimming blade. It will therefore', be seen that the timing of the parts is such 126 that the feed of the fabric takes place first and then a movement of the trimming blade to sever the fabric which has been fed underneath the same. When the parts are in the relation shown in Fig. 1 with the spring 130 59 holding the lever 15 in contact with the stop nut 57, the trimming bla de is in its nor-y mal effective operative position and the reciprocation thereof takes place above the' work support in a. position where the same may sever the fabric. When however, the parts are brought to the position shown in Fig. 2, with the lever 15 in contact with the stop nut 5G, then the trimming blade is brought to a position beneath the' work support so that its reciprocations are entirely eneath the support and its operation is ineffective to sever the fabric. As a means for moving the parts from the position shown in Fig. 1 to that shown in Fig. 2, l have provided a flexible connection 60a which is connected to thelever 15 at the pointGl and at its other end to a suitable knee lever or foot treadle. By the movement of the knee lever or the depression of the treadle, the forward end of the lever 15 may be depressed. thus bringing the lug 54 in contact with the adjustable nut 56. Said nut 56 is adjusted so that when the lever is in contact therewith the trimming blade will reciprocate entirely beneath the work support and be ineffective in its operation. When the treadle or knee lever is released. the spring 59 operates automatically to throw the lever in contact with the stop nut 57 and to raise the trimmer blade` into effective operative position.

By adjusting the stop nuts 57 and 58, the position of reciprocation of the trimming blade may be adjusted.

It will be noted that the trimming blade as illustrated in the present embodiment of my invention, moves up and down in substantially a vertical line and that the material to be trimmed is fed underneath the same by the movements of the feed dog.

My machine is especially adapted as above noted for operating upon two or more superposed layers of fabric wherein it is desired to sever only the lower layer. If the two layers of fabric are made by folding the fabric and it is desired to begin the trim-y ming; at the edge of the fold, the fabric is folded then introduced to the machine and as the feed dog engages the same, said fabric is fed forward against the sharp pointed end of the trimmer blade which penetrates the fabric at the folded edge. enters between the two layers of fabric. lifts the upper layer from the lower layer, supports the upper layer on its upper rounded surface,while the said trimming blade coperates with the station trimming member-to sever the lower layer. Then however, it is desired to begin the trimming operation at a point inside the folded edge as in making turned over neck garments the knee lever or foot treadle is depressed so as to bring the trimming mem-v certain distance and when it is desired to begin the trimming operation said knee lever or treadle is. released. The spring 59 automatically raises the trimming blade in the position shown in Fig. 1. As the trimmingblade moves up through the vwork support into engagement with the fabric, then underneath the presser foot, said fabric is raised as shown in Fig. 17 up into the opening 62 in the said presser foot. In this position both layers of fabric are resting upon the upper rounded surface of the trimming blade and as the feed of the fabric takes place by the movements of the feed dog, said lower layer is caused to be penetrated by thel sharp point of the trimming blade. Said sharp point of the trimming lade is not however, a suilicient distance above the work support as to cause the same to enter the upper layer of fabric. The proper position of the point of the trimming blade for penetrating the lower layer only of the fabric may be brought about by adjusting the stop nuts 57 and 58. After the point of the trimming blade has penetrated the lower layer of fabric, said blade will then continue to separate the layers of fabric as shown in Fig. 18 and to trim the lower layer.

In Fig. 16 of the dra-wings vis shown a sample of work wherein the cutting opera- 9 ,leased and the same may be lifted from its seat on the bracket 34 and the trimming member carried thereby swung from bef'r neath the :work support. By loosening the clamping screw 50 the end of the arm 19 may be released from the. .trimmer supporting rod 27 and the trimmer support 29 together with the trimmer entirely removed from the machine. In replacing the trimmer support, the same is placed upon its seat on the bracket 34 and the clamping bolt turned into a position to hold the `carrier in its seat. The adjusting screw 42 is then turned to bring the movable trimming. blade into proper cooperative trimming vrelation with the sta.- tionary blade.

It will be noted that the rock lever 10 is provided with two arms, one of which operetes the trimming blade, while the other operates to give the feed dog its backward and forward or feeding movement., It will also be noted as shown in Figs. 11 and 1Q that the crank pin 18 is adjustable. Said crank piniscarried by a screw 63 which is mountedox'i the enlarged end of the driving shaft. By turning said screw 631 the crank pin may be moved farther from or nearer to the center of rotation of the driving shaft. This adjustment of the crank pin adjusts the length of feed .movement of the feed dog, and simultaneously adjusts the stroke of the cutting blade.

It Will be noted that the throat plate :2 has one of the usual ribs formed therein by slotting the same to form recesses for the feed dog removed and the stationary cutting member 19 takes the place ofsaid rib. Said stationary cutting member is flush With the top of the throat plate and coperates with said throat plate in supporting the material. Said stationary cutting member also cooperates with a movable cutting blade to shear the fabric.

It is obvious that many changes in the details of construction shown may be made without departing from the spirit of my invention.

Having thus particularly described my invention, what I claim as new and desire to secure by Letters Patent is 1. A trimming mechanism including in combin'ation a trimmer blade, means for operating the same, means under the control of the operator for shifting the Working position of said blade whereby the cutting action thereof is rendered ineffective and means for automatically returning the same to its normal cutting position when released by the operator; substantially as described.

2. A trimming mechanism including in combination a trimming blade mounted beneath the worksupport and extending into cutting position above the Work support, means for operating the same, means for lowering the cutting blade beneath the Work support, whereby its cutting action is rendered ineffective and means for automatically returning the same to cutting position; substantially as described.

3. A trimming mechanism including in combination a work support and a trimming device, comprising a trimming blade, means for moving said trimming blade above the work support, means under the `control of the operator for moving said trimming blade beneath the Work support, and a spring for returning the trimming blade to its operative position above the work support; substantially as described.

4. A trimming mechanism including in combination a Work support, a presser foot, a feeding' mechanism for feeding the material over said Work support, and a trimming mechanism comprising a trimming blade, means for" operating said trimming blade, means for changing the Working position of the trimming blade whereby the cutting action of the same may be rendered ineffective, and an adjustable stop for determining the position of the trimming blade when in effective cutting position; substantially as described.

5. A ltrimming mechanism including in combination a work support a presser foot, a feeding mechanism for feeding the material over said Work support and a trimming mechanism comprising a trimming blade mounted beneath the work support, means for vibrating said trimming br-ide above the work support, an adjustable stel, for determining the position of vibration above the work support, means for moving said trimming blade beneath the Work support and an adjustable stop for limiting the movement of the trimming blade beneath the work support; substantially as described.

6. A trimming mechanism including in combination a Work su port a presser foot, a feeding mechanism or feeding material over said Work support and a trimming mechanism comprising a trimming blade mounted beneath the Work support, means for vibrating said trimming blade above the work support, means under the control t the operator for moving the trimming blade beneath the Work support and automatic means for returning the trimmer blade to its operating position above the work support when released by the operator; substantially as described.

7. A trimming mechanism including in combination a Work support, a presser foot, a feeding mechanism for feeding material over said Work support and a trimming mechanism comprising a trimming blade mounted beneath the work support, means for vibrating said trimming blade above the vigork support, means under the control of the operator for moving the trimming blade beneath the work support, automatic means for returning the trimming blade to its operating position above the work support when released by the operator, an adjustable stop for determining the position of the trimming blade above the work support; substantially as described.

8. A trimming mechanism including in combination a work support, a presser foot, a feeding mechanism for feeding the material over said work support and a trimming mechanism comprising a trimming blade mounted beneath the `work support, means for vibrating said trin'nning blade above the work support, means under the control of the operator for moving the trimming blade beneath the Worltl support, automatic means for returning the trimming blade to its operating position above the work support when released by the operator, and adjustable stops for determining the position of the trimming blade both above and below the Work support; substantially as described.

9. A trimming mechanism including in combination a Work support, a presser tfoot, a feeding mechanism "for feeding the material over said work support and trimming mechanismcomprising a trimming blade, fixed bearings in which said trimming blade oscillates, means for oscillating the trimming blade and. means for lowering said blade beneath the work support whereby its cutting action is rendered ineffective and a sprin for returning said trimmer blade to its e ective cutting position; substantially as described.

10. A trimming mechanism including in combination a work support, a presser foot,

' a feeding mechanism, for feeding material over said work support and a trimming mechanism comprising a trimming blade, means for oscillating said trimmer blade, means for holding said trimming blade in effective operative position above the work support including a lever, means vfor depressing said lever and means for raising the lever and the trimming blade into eiective trimming position, and a stop for limiting the movement of said lever; substantially as described.

11. A trimming mechanism includin in combination a work support, a presser oot, a feeding mechanism for feeding material over `said work support and a trimming mechanism -comprising a trimming blade, mea-ns for operating s trimming blade, means for positioning the trimming blade including a lever, means under the control of the o erator for depressing said lever, a springiiir returnin said lever. and the cutting lade to its e ective cuttingv position; substantially as described.

12. A trimming'mechanism'including in combination a work support, a presser foot, a feeding mechanism for `feeding material over said work support and a trimming mechanism comprising a trimming blade, means for operating said trimming blade, means for positioning the trimming blade including a lever, means under the control of the operator for depressing said lever, a spring for returning said leverland the cuttin lade to its e ective cutting position, an stops for limiting the movement of said lever; substantially as described.

13. A sewing machineincluding in combinationstitch forming mechanism, a work support, a presser foot, a trimming mechanism ldcated in advance of the stitching mechanism vand comprising a trimming blade, means for operating said trimming blade, means whereby the operator may hold said trimming blade out of effective operating position and means for automatically returning the trimming blade to its effective operative osition when released by the operator; su stantially as described.

14. A sewing machine including in conibination stitch forming mechanism, a work support, a presser foot, a trimming mechanismllocated in advance of the stitching mechanism and comprising a trimming blade. means for operating said trimming blade, .means under the control of the operator forholding said trimming blade out of' effective operating position, and means for returning the trimming blade to its effective operative position when released by the operator, and a sto for determining the operative position o' the trimming blade; substantially as described.

l5. A sewing machine including in combination stitch forming mechanism, a work support, a presser foot, a trimming mechanism comprising a trimming blade, means for oscillating said trimming blade, means for lowering said trimming blade beneath the work support whereby its cutting action is rendered ineffective and a spring for returning said trimming blade to its effective operative position above the work support; substantially as described.

16. A sewing machine including in combination stitch forming mechanism, a work support, a presser foot, and a trimming mechanism comprising a trimming blade, means for oscillating said trimming blade, means for lowering said trimming blade benath the work support, whereby its cutting action is rendered ineffective, a spring for returning said trimming blade to its effective operative position above the work support and a stop for determining the position of the trimming blade above the work "support; substantially as described.

17. A sewing machine including in combination stitch forming mechanism, a work support, a presser foot, and -a trimming mechanism comprising a trimming blade, means for oscillating said trimming blade, means for lowering said trimming blade beneath the work support, whereby its cutting action in rendered ineffective, a spring for returning said trimming blade to its effective operative position above the Work support, and an adjustable stop for determining the position of the cutting blade above the work support; substantially as described.

18.' A trimming mechanism including in combination, a Work support, a trimming blade,'a support on which said trimming blade is movably mounted, a fixed trimming blade, a bracket to which said support is detachably connected, whereby said support and trimming blade may be readily removed from the machine and from said fixed blade.

19. A trimming mechanism including in combination, a Work support, a trimming blade, a support on which saidv trimming blade is movably mounted, a fixed trimming blade, said trimmer support being located beneath the work support, a .supporting bracket for said trimmer support., means for detachaby connecting said trimmer support to said bracket, whereby said trimmer support and trimming blade may be readily removed from the work support and from said xed trimming blade.

20. A trimming mechanism including in combination, a work support, a trimming blade, a support in whichsaid trimming blade ismovably mounted, means for operating said trimming blade, and means whereby said trimming blade may be disconnected from its operating means, a fixed trimming blade, a bracket, andmeans for detachably connecting the trimmer support to said bracket, whereby said trimmer support and trimming blade may be readily removed from -the work support and from said fixed blade.

21. A trimming'mechanism including in combination a work support, a trimming blade, a sup ort on which said trimming blade is movaibly mounted, a .fixed trimming blade carried by the work support, a bracket to which said support is detachably connected whereby said support and trimming blade may be readily removed from the machine and from said fixed blade, and means for adjusting said trimmer support for varying the position'of the movable trim ming blade 'relative to said fixed trimming blade.

.22. A trimming mechanism including in combination a movable trimming blade and means for operating the same, a support for said trimming blade, a bracket having a seat formed therein, a rib formed on said trimmer support and engaging said seat, means for holding said rib in said seat, an adjusting screw carried by said support and engaging said bracket whereby said support may be adjusted longitudinally of said bracket; substantially as described.

23. A trimming mechanism including in combination a movable trimming blade and means for operatingthe same, a support for said blade, 'ap brackethaving seat aty its upper end, a rib carried bv said trimmer support and engaging said seata locking r)olt carried by said bracket, having means to engage said support for holding the rib in its seat in the bracket, and an adjusting screw carried bv said support and engaging said bracket wherebyl said support may be adjusted laterally of said bracket; substantially as described.

' 24. In a trimming machine, a cutting de-- vice having a piercingv point adapted to penetrate the fabric, means for operating the same, means to present the material to be severed at an acute angle to the cutting device, means for rendering said cutting device and said fabric presenting means ef- 'fective or ineffective, said means being under the control of the operator, as it is moved from effective to ineffective action, and automatic means to restore the sameto its cifectirc action; substantially as descril'ied. 25. ln a trimming machine, a Work support, a cutting mechanism including a mov` able cutter having a piercing point adapted to penetrate the fabric, means for operatingl the same, means movable in one direc tion for forcinfr the material above the Work support and for rendering the cutter ef tective, and in the opposite direction for rendering said cutting device ineffective, said means being under the control of the operator when moving inone direction, and said means being moved automatically in the other direction.

26. In a sewing machine, suitable stitch forming mechanism, a trimming device normally effective to sever the fabric, means under control of the operator to render said trimming device ineffective and automatic means to restore the trimming device to eifective position when released by the operator, said controlling device being operative without stopping or retarding the action of the stitch forming mechanism; substantially as described.

27. In a trimming mechanism including a feed dog and a cutter, a double armed link having means connected to the feed dog to move the material forward to be cut and also having means to operate the cutter and means to adjust the movement of said link; substantially as described.

28. In a trimming machine, including a feed dog and a cutter, a double armed link one part of which operates the feeding dog, and the other part of which operates the cutter, means for operating said doublearmed link, and means for adjusting the throY of said link, substantially as described.

29. A sewing machine including in combination a work support, stitch forming mechanism, and a trimming mechanism, said trimming mechanism including a fixed trimming blade, a movable trin'iming blade mounted beneath the work support and projecting above and overhan fing the 'Work support,

said movable blade aving a piercing point and a cutting edge in rear thereof, said movable blade being located in front of the stitch forming mechanism, means for operating said movable blade, means under the control of the operator for depressing the movable trimming blade without stopping the stitching mechanism, whereby the point of the blade is carried beneath the planeof the work support and its cutting action rendered ineffective, and automatic means for returning the trimming blade-when released to effective cutting position, said blade engaging` the material passing over the same raising the same and penetrating the lower layer of the material.

30. In a trimming machine, a cutting device, means for operating the same, means for shifting the Working position of the cutting device for rendering the same inef- 5 fective, automatic means for returnin the cutting device to normal cutting position, said cutting device being so constructed as to position the material at an angle to the cutter, so as to penetrate and cut the same.

10 In a trimming machine, a Work support, a cutting mechanism including a cutting blade supported beneath the Work support and normally projecting` above the same to perform its cutting action, means 15 for operating said cutting blade, means for lowering said cutter blade beneath the Work support to render the same ineffective, automatic means for returning said cutter blade to normal cutting position above the Work support, said cutter blade having a 'for- 20 wardly projecting pcnetratin point, for raising said material at an ange to the cutter to penetrate 'zzp-.id cut the same.

In testimony n hereof Iaffix my signature in presence of two Witnesses.

JAMES R. MOFFATT.

Witnesses:

CHESTER MCNEIL, GEO. F. DANFoRTH.

Qopiel o! this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

